464 MOLLUSCA FROM THE HOPE ISLANDS, N. QUEENSLAND, 



Retusa pharetra, n.sp. 

 (Plate xliv., fig. 102.) 



Shell small, rather thin, cylindrical, abruptly truncate above, 

 straight at the sides and produced below, narrowly umbilicate. 

 Colour cream, sometimes alternating with dull white in five or 

 six indefinite belts of equal breadth. Sculpture : the whole 

 surface is cut into small facets by the crossing at right angles of 

 fine, close, longitudinal threads and spiral grooves. These grooves 

 cease near the summit, and leave uncut the threads that cross 

 the crown and descend into the apical crater. Aperture rising 

 above the last whorl, narrow and straight for the upper two- 

 thirds, then dilating. The columella rather broadly reflected 

 over the perforation. Apical crater one-third of the shell's 

 diameter. Length 2-25; breadth I'Omm. 



A few specimens, from 5-10 fathoms, Hope Island, and one 

 from Mast Head Island. In texture, the novelty is intermediate 

 between H. hizona A. Adams, and R. granosa Brazier, but it is 

 smaller and more cylindrical than either. 



Cylichna collyra Melvill. 



Cylichna colhjra Melvill, Proc. Malacol. Soc. vii. 1906, p. 79, 

 Pl.viii., f.25. 



Mr. Gabriel lent me an example of this from the Gulf of 

 Oman, determined by the author of the species. A few examples,. 

 from 5-10 fathoms, off the Hope Islands, prove to be identical. 



PSBUDOCEROS KENTII von Graff. 



Pseudoceros kentii Saville Kent, Great Barrier Reef, 1893, 

 p.362, PI. xiii., f. i; id., Haswell, Trans. Linn. Soc, Zool., 2nd 

 Ser., ix. 1907, p.465. 



On the north arm of Cairns Reef, at low tide, we captured an 

 HexabrancliiLS marginatus^' Quoy & Gaimard, which we brought 

 alive to the " Lotus." We had on board a copy of Kent's 



* Bergh, Siboga Expedition, Livr. xxv, 1905, PI. i., f. 1,2. 



